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Deposition of GdVO4 : Eu3+ nanoparticles on silica nanospheres by a simple sol-gel method

机译：通过简单的溶胶-凝胶法在二氧化硅纳米球上沉积GdVO4：Eu3 +纳米粒子

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摘要

The deposition and coating of GdVO4: Eu3+ nanoparticles on spherical silica was carried out using a simple sol - gel method at low temperature. The GdVO4: Eu3+-coated silica composites obtained were characterized by differential thermal analysis (DTA), thermogravimetric (TG) analysis, x-ray diffraction (XRD), Fourier-transform IR spectroscopy (FT-IR), transmission electron microscopy (TEM), x-ray photoelectron spectroscopy (XPS), photoluminescence spectra, and kinetic decay. It is found that the similar to 5 nm GdVO4: Eu3+ nanoparticles coating the silica spheres are crystal in the as-prepared samples and the crystallinity increases with increasing annealing temperature. The composites obtained are spherical in shape with an average size of 100 nm. The GdVO4: Eu3+ nanoparticles are linked with silica cores by a chemical bond. The photoluminescence spectra of the obtained GdVO4: Eu3+-coated silica composites are similar to those of the bulk GdVO4: Eu3+ phosphors. The strongest peak is near 617 nm, which indicates that Eu3+ is located in the low symmetry site with non-inversion centre.
机译：使用简单的溶胶-凝胶法在低温下在球形二氧化硅上沉积和涂覆GdVO4：Eu3 +纳米颗粒。通过差热分析（​​DTA），热重分析（TG），X射线衍射（XRD），傅里叶变换红外光谱（FT-IR），透射电子显微镜（TEM）对获得的GdVO4：Eu3 +包覆的二氧化硅复合材料进行了表征，X射线光电子能谱（XPS），光致发光光谱和动力学衰减。发现在制备的样品中类似于二氧化硅纳米球的5 nm GdVO4：Eu3 +纳米颗粒是晶体，并且结晶度随着退火温度的升高而增加。所获得的复合材料为球形，平均尺寸为100 nm。 GdVO4：Eu3 +纳米颗粒通过化学键与二氧化硅核连接。所获得的GdVO4：Eu3 +包覆的二氧化硅复合材料的光致发光光谱与本体的GdVO4：Eu3 +荧光粉相似。最强的峰在617 nm附近，这表明Eu3 +位于低对称位点，且具有非反转中心。

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